It is the only naturally preserved tourist cave in Slovenia, so it contains no strong lighting and concrete pathways. Before entering, visitors receive rubber boots and a portable, rechargeable flashlight. Extremely slow growing sinter barriers between lakes (up to 0.1 mm per year) and their fragility present the main obstacle for visitors, which prevents mass tourism and causes a restriction to the daily number of tourist, who can visit the water part of the cave, which is limited to four people.

The main guideline while visiting the cave is to limit consequences of tourism on the sinter barriers and to the level of natural self-restoration of the cave – which places it among the best preserved tourist caves in Slovenia. The maximum credit for that belongs to certain members of the Assotiation of Križna cave lovers, who dedicated much of their time to the cave, and handed out their experience to the younger generations.

Each visit includes a boat tour. On a short tour or a short tour and Bear tunel, you will take a boat ride on Lake I. If you come for a longer 3.5-4 hour tour, the path will lead you across the 13th lakes to Calvary.

On the longest alternative tour to Crystal mountain, takes you over 20 lakes. During the tour the cave guide takes care of moving the boat over sinter barriers.

Despite oligotrophicity, which means a small amount of nutrients in the water, the cave is rich in terms of underground fauna. So far, they discovered 60 underground animal species, which ranks the cave 4th in the world by it’s diversity. Both water and surface animals are frequent: dripstone amphipods (Niphargus stygius), blind amphipods (Niphargus orcinus), cave hedgehog (Monolistra racovitzae), 6 species of tiny snails (3 of them endemic), cave Isopoda (Titanethes albus), cave spider (melted taenaria) drobnovratnik (Leptodirus hochenwartii), cave worm (Pelodrilus Buresch).

Also frequent are periodical cave animals like Lesser horseshoe bats (Together with the Cave Novi križ the second largest wintering spot for bats in Slovenia). Two species actually gained their name after the Križna cave (bug križnojamski brezokec, križnojamska belgrandiela).

First known visitors were from metallic periods of time. Archaeoligists discovered a large amount of old pottery, the oldest of which are almost 5 thousand years old (from the time of Eneolithic, about 2800 B. C.). People didn’t actually live in the cave, but used it as a hideout.

The beginnings of tourism are strongly connected to exploration and research – they can often also be equated. First proofs of  cave »visits« were made in 1557. In the following centuries the cave was constantly, but rarely visited. The most looked at were the entry areas – most of the people didn’t even reach the first lake. With the discovery of cave bear remains the amount of tourism rose.